tls-psk

This package adds PSK cipher suites to the "standard" Go crypto/tls package. Well, since currently the standard crypto/tls package is not extensible, this package uses an "extensible" version (a copy of the standard crypto/tls package with some added functionalities)

This version is compatible with crypto/tls from Go 1.2.2. If you need the newest version (based on Go 1.13.4) you can checkout the release/tag v01.0.0 (tls13 branch)

Installatation

> go get github.com/raff/tls-psk

Usage

// import packages
import (
    "github.com/raff/tls-ext"
    "github.com/raff/tls-psk"
)

// define GetKey and GetIdentity methods

func getIdentity() string {
   return "clientid"
}

func getKey(id string) ([]byte, error) {
   return []byte("secret"), nil
}

// create the appropriate TLS configuration
// note that we specifiy a single cipher suite of type TLS_PSK_*
// also note that the "server" requires a certificate, even if not used here

var (
    config := &tls.Config{
            CipherSuites: []uint16{psk.TLS_PSK_WITH_AES_128_CBC_SHA},
            Certificates: []tls.Certificate{tls.Certificate{}},
            Extra: psk.PSKConfig{
                GetKey: getKey,
                GetIdentity: getIdentity,
                },
            }
)

// start the server
listener, err := tls.Listen("tcp", port, config)

// connect a client
conn, err := tls.Dial("tcp", port, config)